Process of preserving silk weighted with metal salts.



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UNITED STATES PATENT OFFICE.

OTTO MEISTER, OF ZURICH, SWITZERLAND, ASSIGNOR TO WEIDMANN SILK DYEINGCOMPANY, OF PATERSON, NEW JERSEY, .A. CORPORATION OF NEW JERSEY.

PROCESS OF PRESERVING SILK WEIGHTED WITH METAL SALTS.

No Drawing.

Patented May 2, 1911.

To all whom it may concern:

Be it known that I, O'r'ro MEISTER, a citizen of the Republic ofSwitzerland, residing in Zurich, Switzerland, have invented a certainnew and useful Process of Preserving Silk Weighted with Metal Salts; andI do hereby declare the following to be a full, clear, and exactdescription of the invention, such as will enable others skilled in theart to which it appertains to make and use the same.

It is well known that the weighting of color-dyed silk with theso-called tin-phosphate-silicate charge is accompanied by a considerablerisk of reducing the strength and elasticity of the silk filaments sothat the goods manufactured therefrom, especially if subjected to theinfluence of heat or light, but also after more or less length of timemerely in storage, will become so weak and rotten that they aresubstantially use- As a remedy for this, or at least to diminish thelikelihood of its occurrence, it is a well-known expedient to treat thetinweighted silk with rhodan compounds. This treatment, however,involves the disadvantage that, on account of an exceedingly sensitiveferri-rhodan reaction, the silk is exposed to the danger ofdiscoloration in the form of a reddish tinge due to slight traces ofiron.

It has been proposed to avoid the disadvantage alluded to by replacingthe rhodan ammonium by its isomer, sulfoharnstoff (thiocarbamid), asubstance which, having the same composition as rhodan ammonium, canreadily be converted from the latter under the influence of heat andquite as readily reconverted to its original form. But this substance,like hydrochinon or hydrochinonsulfonic acid, also heretofore suggested,is too expensive.

My new process has for its purpose to give to the weighted silk theproperty of more effectively resisting deterioration, in storage and inuse, due to the influences of light, air and humidity, withoutdetracting from the feel and luster of the silk or making it sen sitiveto iron, with accompanying reddish tinge.

The improved process consists in treating the silk with aldehydes, say,aldehydes of the monohydric alcohols, or with compounds containing thesame, for instance, the compound of an aldehyde with bisulfite or withammonia. The aldehyde (for instance, formaldehyde sodium-bisulfite),from 1 to 5% thereof being used, may be added either to the final washor in the earlier stages of the mordanting or dyeing processes, althoughit is to be understood that good results may be obtained without strictadherence to this procedure; for instance, the aldehyde may be appliedat any stage of the mordanting and dyeing process, or to the silkthreads or even to the goods after the process of manufacturing the sameis completed.

I claim:

1. In the art of weighting silk by the use of metal salts, the processof preserving the silk which consists in treating the same with analdehyde of a monohydric alcohol, substantially as described.

2. In the art of weighting silk by the use of metal salts, the processof preserving the silk which consists in treating the same with acompound containing an aldehyde of a monohydric alcohol, substantiallyas described.

8. In the art of weighting silk by the use of metal salts, the processof preserving the silk which consists in treating the same with acompound of an aldehyde of a monohydric alcohol and a bisulfite,substantially as described.

4. In the art of weighting silk by the use of metal salts, the processof preserving the silk which consists in treating the same with analdehyde, substantially as described.

In testimony whereof, I have hereunto set my hand this 20th day ofSeptember, 1910.

OTTO MEISTER.

Witnesses:

Elvin. MEISTER, JULIUS JKccLr.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

